I’m looking for some clarifications on eBay rules please

It is ok to list 2 or more of the same item with the same description and buy it now price or would this be a violation of eBay rules under duplicate listings?

It is ok to list 2 or more of the same item with the same description and buy it now price but with a different order of images, all duplicates having the same images or would this be a violation of eBay rules under duplicate listings?

It is ok to list 2 or more of the same item with the same description and buy it now price in with other items (ie compiling multiple listings in a new listing) or would this be a violation of eBay rules under compilation listings?

It is ok to list 2 or more of the same item with a variation as different listings – so a birthday card that has an age on it for example. Would it need to be one item with a drop down option when buying showing different ages or could a seller list 99 listings – the same item & design but with a different age on each one, so one listing for 1st birthday, one listing for 2nd birthday and so on or would this be a breach of eBay rules under duplicate listings?